But the US companies seem to always have a disclaimer, "for racing use only, absolutely no warranty". So it's still up to the user to determine what is safe and what isn't.
That's because US companies can be reached by ambulance chasing lawyers and their idiot clients who don't know what they are doing. Everyone knows - race car parts have no warranty.
Who you going to go after if the ebay junk breaks? Or you need a replacement part? Or you'd like some tuning advice?
If the results don't match the theory, change the theory.
